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Flashcards in Waves Deck (25):
1

Give examples of transverse waves

Light, secondary waves and all of the EM waves

2

Give examples of longitudinal waves

Primary, sound

3

How do transverse waves travel?

At 90 degrees to the direction of the vibration

4

How do longitudinal waves travel?

In the same direction as the vibration

5

What are the conditions for refraction?

Light must enter the object at an angle greater than 0 degrees and less than 90 degrees

6

Define refraction

The bending of light

7

As light passes from air to glass, is the refracted ray bent towards or away from the normal?

Towards

8

As light passes from glass to air, is the refracted ray bent towards or away from the normal?

Away

9

What is the angle of incidence equal to?

The angle of reflection

10

Why does light bend towards the normal when passing from a less dense medium into a denser medium?

It slows down

11

Why does light bend away from the normal when passing from a more dense medium into a less dense medium?

It speeds up

12

What happens when the angle of incidence is greater than the critical angle?

Total internal reflection

13

What are the 2 conditions for total internal reflection?

1. The angle of incidence is > than the critical

2. Light travels from a denser medium to a less dense medium

14

Name 2 things that use total internal reflection

Endoscopes and optical fibres

15

What instrument is used to detect seismic waves?

Seismometer

16

Which seismic wave is fastest?

Primary

17

Which seismic wave can travel through liquids and solids?

Primary

18

Which seismic wave is second fastest?

Secondary

19

Which seismic wave can travel through solids only?

Secondary

20

Which seismic wave is slowest?

Surface

21

Which seismic wave is the most destructive and why?

Surface as they travel around the Earth's surface and may produce a rolling motion

22

How have scientists used effects of earthquakes to find the Earth's structure?

S wave shadow zone suggests that part of the Earth's core is liquid

Positions that waves are detected suggest that the density of rock changes, as waves are refracted

23

If seismic waves are bent in curves, what does it suggest about the density of rock in the inner Earth?

It changes gradually

24

If seismic waves are bent sharply, what does it suggest about the density of rock in the inner Earth?

It changes suddenly

25

Name the two types of wave

Transverse and longitudinal